Marking pen



FIG. 1 is a perspective view of a marking pen;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a perspective view in an exploded condition showing the upper and lower caps of the marking pen being opened. 

The ornamental design for a marking pen, as shown and described. 